.filter-menu-button {
    -fx-background-image: url('funnel-icon.png');
    -fx-background-repeat: no-repeat;   
    -fx-background-position: center center;
    -fx-background-color: transparent;
    -fx-scale-y: 0.8;
}
.filter-menu-button:hover {
    -fx-background-image: url('funnel-pencil-icon.png');
}
.filter-menu-button.active{
    -fx-background-image: url('funnel-active-icon.png');
}
.filter-menu-button.active:hover {
    -fx-background-image: url('funnel-pencil-active-icon.png');
}
.filter-menu-button:focused {
    -fx-background-insets: 0, 0, 1, 1;
}